流感是一种通常在每年秋天和冬天发生的病毒性疾病。

The flu is a viral disease that tends to appear in the fall or winter each year.

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流感是一种通常在每年秋天和冬天发生的病毒性疾病。

The flu is a viral disease that tends to appear in the fall or winter each year.

youdao